1985 400i fuel return line question | FerrariChat

1985 400i fuel return line question

Discussion in '365 GT4 2+2/400/412' started by high123bid, Nov 7, 2018.

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  1. high123bid

    high123bid Rookie

    Dec 20, 2013
    27
    Minneapolis, MN
    Full Name:
    Bo Andersen
    #1 high123bid, Nov 7, 2018
    1985 Ferrari 400i fuel system question: The (new) 113978 Bosch fuel accumulators had their return lines missing from the little 90 degree tubes in the back. I have located two return lines than run from the top of each fuel tank through the back of the trunk and, strangely, ALL the way to the engine compartment. There are no provisions for connecting the fuel accumulator return line. Suggestions? The factory drawing does not help: https://algarferrari.com/store/parts/12-cylinder/gt-group-2-2/400-gti-automatic-i/table-9
     
  2. high123bid

    high123bid Rookie

    Dec 20, 2013
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    Minneapolis, MN
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    Bo Andersen
    #2 high123bid, Nov 7, 2018
    It is also know as the REFLUX pipes 114960. Where do they go, please?
     
  3. high123bid

    high123bid Rookie

    Dec 20, 2013
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    Minneapolis, MN
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    Bo Andersen
    #3 high123bid, Nov 7, 2018
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  4. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    25,144
    30°30'40" N 97°35'41" W (Texas)
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    Steve Magnusson
    #4 Steve Magnusson, Nov 7, 2018
    That's a trick question ;) The 90 deg fitting on the back end of the 113978 Accumulator is just a vent to atmosphere. If the diaphragm inside the Accumulator fails -- fuel will come out, but, in normal operation just outside air should move in on out. On euro models, they just leave that fitting open to atmosphere (no hose connected). On US models, they run a hose from that fitting back to the fuel tanks (so, if fuel ever did come out, it wouldn't just drop on the ground). If your 400i is still in a stock euro configuration = no hose present. If your 400i had been modified to be US legal = it might have had a hose added going bank to the tank (but it's only a "safety"/emission thing -- there shouldn't be any liquid fuel in such an added line in normal operation).

    The lines going from the fuel tank to the engine bay are the fuel return lines from the fuel distributor/pressure regulator.
     

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